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Regarding this pair of X20 speaker cables:
This particular pair was made specifically for a High End Audio affiliate to use in their test system. It is a standard pair of the X20 that was placed inside a protective outer tube and had the ends sealed off with Carbon Fiber and special vibration damping epoxies. The Rhodium spades have been cold welded to the conductors.
The cables were overbuilt for their purposes and remain in excellent condition.
This pair was traded in towards an upgrade to the X30 speaker cables.
Full warranty remains and is always transferable.

Regarding the X20 speaker cables in general:
Three aspects of this design have been independently laboratory tested.
1)They are among the lowest impedance cables available anywhere. This translates into greater damping capability for your amplifier and thus increased dynamic playback for your speakers.
2) They have the greatest measured rejection and filtering of EMI and RFI distortions available. This translates into blacker backgrounds, finer detail, and better nuance in the music.
3)They have the lowest harmonic distortion that at least one independent laboratory had ever measured, and not just for speaker cables. This translates into an uncanny ability to convey a live presence in the music being fed through them. They convey a sense of ease for the listener. Vocals are easier to understand and instruments more easily convey the emotional appeal of the musicians playing them. This is the hallmark of their reputation.

These three aspects, independently measured by internationally known laboratories, are why these cables consistently best more popular brands, at many times their cost, in head to head comparisons. It is why the physicists at Running Springs Audio contracted us to design their top shelf and award winning power cables.
No mysterious cable voodoo here. Just the judicious application of knowledge from world class scientists.
One of the best kept secrets in High End Audio!